package com.nowcoder.community.interceptor;/**
 * 功能描述
 *
 * @author 21775
 * @date 2022/09/15  22:08
 */

import com.nowcoder.community.dao.LoginTicketMapper;
import com.nowcoder.community.dao.UserMapper;
import com.nowcoder.community.entity.LoginTicket;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.utils.CookieUtil;
import com.nowcoder.community.utils.HostHolder;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.context.SecurityContextImpl;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;

/**
 *@ClassName LoginTicketInterceptor
 *@Description TODO 显示用户信息
 *@Author 21775
 *@Date 2022/9/15 22:08
 *@Version 1.0
 */
@Component
public class LoginTicketInterceptor implements HandlerInterceptor {
    @Resource
    private UserService userService;

    @Resource
    private HostHolder hostHolder;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取cookie
        String ticket= CookieUtil.getValue(request,"ticket");
        if (ticket != null) {
            // 查询凭证
            LoginTicket loginTicket = userService.selectByTicket(ticket);
            // 检查凭证是否有效
            if (loginTicket != null && loginTicket.getStatus() == 0 && loginTicket.getExpired().after(new Date())) {
                // 根据凭证查询用户
                User user = userService.findUserById(loginTicket.getUserId());
                // 在本次请求中持有用户
                hostHolder.setUser(user);
                // 构建用户认证的结果,并存入SecurityContext,以便于Security进行授权.
                Authentication authentication = new UsernamePasswordAuthenticationToken(
                        user, user.getPassword(), userService.getAuthorities(user.getId()));
                SecurityContextHolder.setContext(new SecurityContextImpl(authentication));
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        User user=hostHolder.getUser();
        if(user!=null&&modelAndView!=null){
            modelAndView.addObject("loginUser",user);
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        hostHolder.clear();
        SecurityContextHolder.clearContext();
    }
}
